Improvement in photographic-printing- frames



luted gime @anni diamine,

PETER MURPHY, OF NEW YORK, N. Y., ASSIGNOR TO E. AND H. T. 'ANTHON Y & OO., OF SAME PLACE.

Y Letters Patent .No. 99,462, dated February 1, 1870.

IMPROVEMENT IN PHOTOGRAP'HIC-PRINTING FRAMES.

The Schedule referred to in these Letters Patent and making part of the lame.

To all whom 'it 'may concern Be it known that I, PETER' MURPHY, of the city and State'of New York, have invented an Improve-` i ment in Photographic-Printing Frames for porcelain or glass pictures; and I hereby declare the following to be a correct description of the same.

This invention has for 'its object the securing of the vporcelain or glass plate to the swinging back of the printing-frame, so that the process of printing can be observedfrom time to time. This has usually before been done by adhesive material, or by a costly exhausting-device, both of which are liable to lose their hold, especially when employed vwith the `heavy white Vglass now usually made use of.

1M y invention consists in a clamping segmental but? ton, taking over the corner of the porcelain or glass,I

to hold the same, or when slackened and turned aside, allowing theremoval or insertion of' the plate for the picture, the said segmental button being ,combined with the swinging back and plate-holding,and printing-frame.

In thedrawinga represents the frame, with the glass b,-

' ofthe hack of the flame, hinged, at 2, to the strip el,

that is hinged tot-he frame a, at 4, so as to allow of the introduction of any desired thickness of plate; and e e are the howsprings passing under flanges upon a. These' parts, thus far described, are ot' any desired size andvconstruction, and being well known, do not require'further explanation.

I have shown in Figure 1 only a portion of the npper side of the printing-frame, and, in Figure 2, a sec tion at the line :i: 9:.

My clamping segmental buttons are so placed as t0 act at two or more places upon the surface of the plate,

near the corners or edges.- v

Eaoh clamping segmental button is made with 'a stem, fi, passing through the back c,and provided with a thumb-nut, k, at the outer end, and 'a segment of a disk, o, at the other end, as seen in tig. 1, so as to form a button to take over the edge' of the plate l, and holdthe same firmly to the back c. -When the plate is to be removed, it is. only necessary to loosen the nut k, and turn the disk o around from off the 'plate l.

Y The lnegative-glass, n, is to be held upon the glass v b by strips of pasted paper, or other adhesive snb stances, as usual, but the corners should be removed, as shown, to give room for the segmental button o, so

that the surfaces of the plates can come into contact.

I am aw'are that clamps have been employed in printing-frames, the same acting against the edges of the glass or across the ends. These clamps, however', are not as convenient for inserting or withdrawing the plate, or else do not hold the same with sufficient firmness. By the use of segmental disks, as the button-heads at the end of the clamping-screws, that are applied at two of the corners, the plate is held very rmly, but canv 

